/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.cyw.baselibrary.view.recycleViewdecoration;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

import com.cyw.baselibrary.R;


/**
 * recycleview 间距
 */
public class DividerLineDecoration extends RecyclerView.ItemDecoration {

    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
    private static final int[] ATTRS = new int[]{
            android.R.attr.listDivider
    };
    private Drawable mDivider;

    private int mOrientation;
    private boolean isHasFootLine = false;
    private boolean isHasHeadSpace = true;
    private int space;
    private boolean isNeedLine;
    private Paint mPaint;
    private boolean doNot = false;

    public DividerLineDecoration(Context context, int orientation, boolean isHasFootLine) {
        this.isHasFootLine = isHasFootLine;
        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaint.setColor(context.getResources().getColor(R.color.line));
        mPaint.setStyle(Paint.Style.FILL);
        a.recycle();
        setOrientation(orientation);
    }

    public DividerLineDecoration setDivider(Drawable mDivider) {
        this.mDivider = mDivider;
        return this;
    }

    public void setOrientation(int orientation) {
        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        if (mOrientation == VERTICAL_LIST) {
            if (isNeedLine) {
                drawVertical(c, parent);
            }
        } else {
            drawHorizontal(c, parent);
        }
    }

    public void drawVertical(Canvas c, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();

        final int childCount;
        if (!isHasFootLine) {
            childCount = parent.getChildCount() - 1;
        } else {
            childCount = parent.getChildCount();
        }
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin +
                    Math.round(ViewCompat.getTranslationY(child));
            final int bottom = top + 1;
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
            if (mPaint != null) {
                c.drawRect(left, top, right, bottom, mPaint);
            }
        }
    }

    public void drawHorizontal(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int left = child.getRight() + params.rightMargin +
                    Math.round(ViewCompat.getTranslationX(child));
            final int right = left + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    /**
     * 分割线
     * @param isNeedLine
     * @return
     */
    public DividerLineDecoration setIsNeedLine(boolean isNeedLine) {
        this.isNeedLine = isNeedLine;
        return this;
    }

    /**
     * 设置间距
     *
     * @param space
     */
    public DividerLineDecoration setSpace(int space) {
        this.space = space;
        return this;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        if (doNot) {
            return;
        }
        super.getItemOffsets(outRect, view, parent, state);
        if (mOrientation == VERTICAL_LIST) {
            if (parent.getChildLayoutPosition(view) == 0) {
                if (isHasHeadSpace) {
                    outRect.set(0, space, 0, 1);
                }
            } else {
                outRect.set(0, space, 0, 1);
            }

        } else {
            outRect.set(0, space, mDivider.getIntrinsicWidth(), 0);
        }
    }

    public DividerLineDecoration setHasFootLine(boolean isHasFoot) {
        this.isHasFootLine = isHasFoot;
        return this;
    }

    public DividerLineDecoration setHasHeadSpace(boolean isHasHead) {
        this.isHasHeadSpace = isHasHead;
        return this;
    }

    /**
     * 不要任何分隔符
     * @param doNot
     */
    public void setDoNot(boolean doNot) {
        this.doNot = doNot;
    }
}
